Samsung SCH - I959 GALAXY S4 CDMA can not access the network

Hello ,
I bought a Galaxy S4 SCH - I959 , and came back to my home in Brazil , however it does not work galaxy data network , can not access the network , always appears restricted network , and already checked the EMEI it is not locked . what should I do ?

Welcome to Android Central! Have you compared the network bands that the phone uses with the ones that your wireless carrier uses? If there's no overlap, then the phone won't be able to connect to the network.